126.96.36.199.1 usually have considerable extracellular matrix between them
188.8.131.52.1.1 consists of fibers and a ground substance
2.2.2 Location → widely distributed throughout the body
2.2.3 Characteristics → Mostly have a good blood supply, cells are farther apart than epithelial cells,
extracellular matrix in between
184.108.40.206 Major Cell Types
220.127.116.11.1 Fibroblasts produce collagen and elastic fibers
18.104.22.168.2 Macrophages are phagocytes (“eat cells”)
22.214.171.124.3 Mast cells may release heparin and histamine
126.96.36.199 Connective Tissue Fibers
188.8.131.52.1 Collagen fibers have a great tensile strength.
184.108.40.206.2 Elastic fibers are composed of elastin and are stretchy.
220.127.116.11.3 Reticular fibers are fine collagen fibers.
18.104.22.168 Categories of connective tissues
22.214.171.124.1 Loose Connective Tissue
126.96.36.199.1.1.1 forms thin membranes between organs and binds them together. Found beneath the skin and
188.8.131.52.1.2.1 stores fat, cushions, and insulates. Found beneath the skin; in certain abdominal membranes; and
around the kidneys, heart, and various joints.
184.108.40.206.1.3.1 thin branched reticular fibers. Supports the walls of the liver and spleen
220.127.116.11.2 Dense Connective Tissue
18.104.22.168.2.1 Dense Regular
22.214.171.124.2.1.1 strong collagen fibers that bind structures as parts of tendons and ligaments
126.96.36.199.2.2 Dense Irregular
188.8.131.52.2.2.1 thicker, randomly distributed collagen fibers and is found in the dermis.
184.108.40.206.2.3.1 elastic fibers that make up hollow internal organs like the lungs and blood vessels
220.127.116.11.3 Specialized Connective
18.104.22.168.3.1.1 Consists of fibers and a gel-like substances Lacks a direct blood supply, so it is slow to heal Found at the
ends of various bones; in the ear; in the larynx; and in the pads between the bones of the spinal column,
pelvic girdle, and knees
22.214.171.124.3.2.1 matrix consists of mineral salts and collagen. Compact
& spongy bones. Heals rapidly
126.96.36.199.3.3.1 Composed of cells suspended in fluid. Produced in the tissue of hollow parts of certain bones.
2.3.1 Function → movement
2.3.2 Location → attached to bones, in the walls of hollow internal organs, heart
2.3.3 Characteristics → Able to contract in response to specific stimuli
188.8.131.52 Muscle cells are also called muscle fibers.
184.108.40.206 Skeletal muscle makes up about 40% of body weight & smooth and cardiac muscle makes up about 10%
220.127.116.11 Function - movement of body parts, facial expressions, writing, talking, singing, chewing, swallowing, and
18.104.22.168 Muscles that contain skeletal muscle tissue are usually attached to bones.
22.214.171.124 also called voluntary muscle tissue
126.96.36.199 The cells are long → about 40 mm in length and threadlike → less than 0.1 mm in width.
188.8.131.52 contain striations → alternating light and dark cross-markings
184.108.40.206 muscle cell contract when stimulated by a nerve cell, then relaxes when it is no longer stimulated
220.127.116.11 contains no striations
18.104.22.168 The cells are shorter than skeletal muscle cells and are spindled shaped.
22.214.171.124 one central nucleu
126.96.36.199 Found in the walls of hollow internal organs → stomach, intestines, bladder, uterus, blood vessels.
188.8.131.52 under involuntary contro
184.108.40.206 Found only in the heart.
220.127.116.11 The cells are striated, branched, joined end-to-end, and interconnected in a complex network.
18.104.22.168 Each cell contains a single nucleus.
22.214.171.124 Specialized intercellular junction → the connection between cardiac muscle cells → called intercalated
126.96.36.199 These muscles are under involuntary control
188.8.131.52 Can continue to function without nervous stimulation.
2.4.1 Function → conduct impulses for coordination, regulation, integration, and sensory reception
2.4.2 Location → brain, spinal cord, nerves
2.4.3 Characteristics → cells communicate with each other and other body parts
2.4.4 Basic cells called neurons and are highly specialized.
184.108.40.206 sense certain types of changes in their surroundings
220.127.116.11 have dendrites, which receive sensory information and transmit the message as an electrical signal to
18.104.22.168.1 The axon sends the message to the next neuron or to muscles or glands
22.214.171.124 Function is to coordinate, regulate, and integrate many body functions
126.96.36.199 Supporting cells of the nervous tissue
188.8.131.52 Some of the neuroglia bind and support nervous tissue.
184.108.40.206 Some of the neuroglia carry out phagocytosis, which means “to eat cells”
220.127.116.11 Helps protect nervous tissue by engulfing cellular debris, waste, and foreign material.
18.104.22.168 Some of the neuroglia connect neurons to blood vessels.
22.214.171.124 Some of the neuroglia are involved in cell-to-cell communication.